定义一个哺乳动物 Mammal 类，再由此派生出狗 Dog

[问答题]

定义一个哺乳动物 Mammal 类，再由此派生出狗 Dog 类，定义一个 Dog 类的对象，观察基类与派生类的构造函数与析构函数的调用顺序。

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1185925亓乂

解：

源程序：

#include <iostream.h>
enum myColor{ BLACK， WHITE };
class Mammal
{
public:
// constructors
Mammal();
~Mammal();
//accessors
int GetAge() const { return itsAge; }
void SetAge(int age) { itsAge = age; }
int GetWeight() const { return itsWeight; }
void SetWeight(int weight) { itsWeight = weight; }
//Other methods
void Speak() const { cout << "Mammal sound!\n"; }
protected:
 int itsAge;
int itsWeight;
};
class Dog : public Mammal
{
public:
Dog();
~Dog();
myColor GetColor() const { return itsColor; }
void SetColor (myColor color) { itsColor = color; }
void WagTail() { cout << "Tail wagging...\n"; }
private:
myColor itsColor;
};
Mammal::Mammal():
itsAge(1)，
itsWeight(5)
{
cout << "Mammal constructor...\n";
}
Mammal::~Mammal()
{
cout << "Mammal destructor...\n";
}
Dog::Dog(): itsColor (WHITE)
{
cout << "Dog constructor...\n";
}
Dog::~Dog()
{
cout << "Dog destructor...\n";
}
int main()
{
Dog Jack;
Jack.Speak();
Jack.WagTail();
cout << " Jack is " << Jack.GetAge() << " years old\n";
return 0;
}